import time as t

class MyTime():
    def __init__(self):
        self.unit = ['年', '月', '日', '小时', '分钟', '秒']
        self.prompt = '未开始计时！'
        self.lasted = []
        self.begin = 0
        self.end = 0

    def __str__(self):
        return self.prompt

    __repr__ = __str__

    def __add__(self, other):
        prompt = "总共运行了"
        result = []
        for index in range(6):
            self.lasted.append(self.end[index] - self.start[index])
            if self.lasted[index]:
                self.prompt += (str(self.lasted[index]) + self.unit[index])
        return prompt
    # 开始计时

    def start(self):
        self.begin = t.localtime()
        self.prompt = "提示：请先调用stop()停止计时"
        print("计时开始")

    # 停止计时
    def stop(self):
        if not self.begin:
            print("提示:请先调用start()进行计时")
        else:
            self.end = t.localtime()
            self._calc()
            print("计时结束")

    # 内部方法
    def _calc(self):
        self.lasted = []
        self.prompt = "总共运行了"
        for index in range(6):
            self.lasted.append(self.end[index] - self.start[index])
            if self.lasted[index]:
                self.prompt += (str(self.lasted[index]) + self.unit[index])
